a. Use Troutons rule, Hvap (88 J mol-1 K-1) H vap (88 J mol -1 K -1 ) to estimate the enthalpy of

a. Use Trouton’s rule, ΔHvap° ≈ (88 J mol-1 K-1) ΔH°_vap ≈ (88 J mol^-1 K^-1) to estimate the enthalpy of vaporization of octane (b.p. 126°C). (b.p. 126°C)
b. Use the form of the Clausius-Clapeyron equation below to estimate the vapor pressure in bar of octane at the column temperature in Figure 24-9 (70°C).(70°C).

c. Calculate the vapor pressure in bar for hexane (b.p. 69°C)(b.p. 69°C) at 70°C.70°C.
d. What is the relationship between solute vapor pressure and retention?
e. Why is the technique called “gas chromatography” if retained analytes are only partially vaporized?

Figure 24-9

A IL (17) -- (^) ( 1 - 12) In R T T In(P1P2)-(AHvapR)(1T1-1T2)